Explain the in advance check box further and how it affects the service from to dates and what that may or may not do to an invoice.

Also how to change in-advance. Interesting this does not change the dates - should it? Or a messagebox appear asking if they want to?

 

 

As a customer can have any number of agreements you can decide if each of those agreements generates an individual invoice or combines them onto a single invoice. Taking our example customer 'Star Coffee Ltd' that has 3 agreements. Each agreement is marked as 'Individual Invoice', therefore they will all be combined onto a single invoice.